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@Gordon
Yes, connect both SPI pins to controller data, but connect SPI MOSI via a resistor (1k Ohm?) so that it isn't 'fighting' the controller for output.
Sure - SPI sends out (and receives) a long stream of bits. If the controller really is sending out bits as short as 1uS that's really pretty fast, and might not be reliable with setWatch.
So what you can do is to send out the data to the controller with SPI, but also just send out lots of
0bits as well. That won't send any data to the controller, but it will cause a series of bits to get recorded into the returned array - and you can then look at that array and try and work out what the controller sent.